This is a OEM or compatiblebattery can replace the following battery part nrs:
A1321 020-6380-A 661-5211 661-5476 10.95V
73/77.5WH
This battery is applicable to the following laptop models: MacBook Pro 15 inch A1286 (2009/2010 series Version) MacBook Pro 15 MB985CH/A MacBook Pro 15 MB985 MacBook Pro 15 inch MB985*/A MacBook Pro 15 inch MB985CH/A MacBook Pro 15 inch MB985J/A MacBook Pro 15 inch MB985LL/A MacBook Pro 15 inch MB985TA/A MacBook Pro 15 inch MB985X/A MacBook Pro 15 inch MB985ZP/A MacBook Pro 15 inch MB986*/A MacBook Pro 15 inch MB986CH/A MacBook Pro 15 inch MB986J/A MacBook Pro 15 inch MB986LL/A MacBook Pro 15 inch MB986TA/A MacBook Pro 15 inch MB986X/A MacBook Pro 15 inch MB986ZP/A MacBook Pro 15 inch MC118 MacBook Pro 15 inch MC118*/A MacBook Pro 15 inch MC118CH/A MacBook Pro 15 inch MC118J/A MacBook Pro 15 inch MC118LL/A MacBook Pro 15 inch MC118TA/A MacBook Pro 15 inch MC118X/A MacBook Pro 15 inch MC118ZP/A MacBook Pro 15 inch Precision Aluminum Unibody (2009 Version)
 
Mac.Infinity Tips
How to prevent swollen battery?
 
Keep the battery cool for the most part – in other words, keep it within regular laptop operating temperatures. Don’t store it in the sun or use it plugged in for long periods of time in the sun.
Use the right capacity Apple charger or quality third-party manufacturer charger.
Don’t leave the laptop constantly plugged in when it doesn’t need to be.
Replace old batteries that are not holding their charge anymore.
 
 
Battery Installation by Mc.Infinity 
https://www.macinfinity.sg/macbook-battery-replacement